有没有办法使用 protobuf-csharp-port generated 类 with servicestack.ormlite？

Question

我有大量使用 protobuf-csharp-port 生成的 C# 类。我最终为他们创建了自己的简单 ORM 机制。

事实证明，OrmLite 正是我想要的。但我现在 "stuck" 使用 protobuf 类。最大的问题是对于每个实体，我有两个类：EntityClass（只读）和 EntityClass.Builder.

有什么方法可以集成 OrmLite 和 protobuf-csharp-port 类（及其构建器）吗？

Answer 1

我设法让它像这样工作：

我为 IDbConnection 创建了一个 InitProtoTable 扩展，它需要在程序的最开始为每个原型调用，例如：

  var dbFactory = new OrmLiteConnectionFactory(...);
  var db = dbFactory.Open();
  db.InitProtoTable<Person.Builder>();

之后，可以调用OrmLite方法：

  db.DropTable<Person.Builder>();
  db.CreateTable<Person.Builder>();

扩展如下所示：

public static class OrmLiteExtensions
{
    public static void InitProtoTable<B>(this IDbConnection db)
        where B : IBuilder, new()
    {
        var desc = new B().DescriptorForType;
        var model = ModelDefinition<B>.Definition;
        model.Name = desc.Name;
        model.IgnoredFieldDefinitions.Clear();
        var fieldList = new List<FieldDefinition>();
        var fieldMap = desc.Fields
            .ToDictionary(f => f.Name, StringComparer.OrdinalIgnoreCase);
        foreach (var field in model.FieldDefinitions)
        {
            if (fieldMap.ContainsKey(field.Name)) fieldList.Add(field);
        }
        model.FieldDefinitions = fieldList;
        model.AfterInit();

        if (db.TableExists<B>())
        {
            var columns = GetColumnNames<B>(db, model.ModelName);
            var missing = model.FieldDefinitions
                .Where(field => !columns.Contains(field.FieldName));
            foreach (var field in missing)
            {
                field.DefaultValue = fieldMap[field.Name].DefaultValue.ToString();
                db.AddColumn(typeof(B), field);
                Console.WriteLine(db.GetLastSql());
            }
        }
    }

    private static HashSet<string> GetColumnNames<T>(IDbConnection db, string tableName)
    {
        using (var cmd = db.CreateCommand())
        {
            // Workaround to RDMS agnostic table column names discovery.
            cmd.CommandText = string.Format("SELECT * FROM {0} WHERE 1!=1", tableName);
            var table = new DataTable();
            table.Load(cmd.ExecuteReader());
            return new HashSet<string>(
                table.Columns.OfType<DataColumn>().Select(c => c.ColumnName));
        }
    }
}

有没有办法使用 protobuf-csharp-port generated 类 with servicestack.ormlite？

Is there way to use protobuf-csharp-port generated classes with servicestack.ormlite?

c#

ormlite-servicestack

protobuf-csharp-port